What is the value of m?

12+(7+m)=30

 11

Step-by-step explanation:

The given equation :            (1)

Using Associative property of addition :

We have,

                    (2)

From equation (2) and (1), we get

Using Subtraction property of equality, subtract 19 from both sides, we get

Hence, the value of m=11

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)